49 lines
734 B
C
49 lines
734 B
C
#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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int
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head(FILE *file, int lines)
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{
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if(file == NULL) {
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fprintf(
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stderr, "error opening file: %i = %s\n", errno, strerror(errno));
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return 1;
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}
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int a;
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int c = 0;
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while((a = fgetc(file)) != EOF) {
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if(a == '\n')
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++c;
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putchar(a);
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if(c == lines)
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return lines;
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}
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return lines;
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}
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int
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main(int argc, char *argv[])
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{
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int lines = 10;
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switch(argc) {
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case 1:
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head(stdin, lines);
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break;
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case 2:
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head(fopen(argv[1], "r"), lines);
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break;
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case 3:
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lines = abs(atoi(argv[1]));
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head(fopen(argv[2], "r"), lines);
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break;
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default:
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lines = atoi(argv[2]);
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head(fopen(argv[3], "r"), lines);
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break;
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}
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return 0;
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}
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